19.Ozone.depletion.15 - Photochemistry and Ozone Depletion...

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Photochemistry and Ozone Depletion Structure of the Atmosphere Ozone in the Troposphere and Stratosphere Ozone Depletion Health/Environmental Effects Summary and Conclusions
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Sunlight and the Electromagnetic S Shorter wavelengths contain more energy UV Ozone filters wavelengths below 290 nm
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The Ozone Layer Absorbs Harmful UV Ray Filtering is protective for all life forms
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Ozone Layer and the Atmospher Normally temperature and pressure are directly related Altitude is usually accompanied by a drop in pressure However, ozone in the stratosphere reverses the trend
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Ozone in the Troposphere – Undes Produced by electric motors and reactions between NOx and volatile organic chemicals Sources of NOx include engines and other combustion Sources of VOCs include engine exhaust and green plants
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Ozone in the Stratosphere – Des Ozone filters UV, converting it to less dangerous IR
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The Chlorofluorocarbons Refrigerants – air conditioners and refrigerators Spray propellants – aerosol cans Plastic foam blowing – “styrofoam”
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Ozone-Depleting Chemicals Over
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Chain-Reaction Ozone Destruction by NO in the stratosphere can deplete ozone
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Chain-Reaction Ozone Destruction b Chlorine radical in the stratosphere can also deplete ozone
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Ozone Depletion – Most Severe at t
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Arctic Ozone Averages Since 19
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Why the Poles?
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